diff --git a/requirements.txt b/requirements.txt
index ee13259..def436e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -73,7 +73,7 @@ toolz==0.8.2
 tornado==4.5.2
 tqdm==4.19.4
 traitlets==4.3.2
-ujson==1.35
+ujson==5.2.0
 urllib3==1.22
 wcwidth==0.1.7
 Werkzeug==0.12.2